Assionob



C. S. BURTON QIL GUN Dec. 18, 1928.

Original Filed m 4, 1925 a which sometimes is provided at the oi 86 let. The nozzle 15 is counterbored at 26 back,

, of its discharge port to spring 16 in the chamber 26.

Reissued' be. 18, 1928.-

i Re. 17,16

UNITED STATES, PAT NTo FicE. g

cmanrs summon, or can ranx, rumors, assmuoajnr uns m assiemmfi'rs,

TO ALEMITE MANUFACTURING CORPORATION, OF CHICAGO, IILINOIB, A COB- POBATION or DELAWARE.-

Original llo. 1,582,969,dated m 4, 1926, Serial in. 510,571, filed January 1 reissue filed Bay 2, 1928. Serial No. 274,804.

The purpose of this invention is to provide a lubricant injecting device of the type commonly called an oil *gun which shall be of simple construction and obvious'mode 5 of operation for forcing lubricant into the bearings of a mechanism such as an auto embodying this invention with the piston member at withdrawn position; I

Figure 2 is a detail section at the line 2 2 on Figure 1;

Figure 3 is an axial section of the device with the piston at in-thrust osition; and

Figure 4 is a detail inverted plan view of a valve cage for retaining a check valve in the pi'ston.

The construction shown in, the drawin comprises a cylindrical reservoirl for hol ing the lubricant, having a diametrically reduced end portion 4 constituting a pump cylinder whose discharge and is fitted with a nozzle member 24 conically tapered toward its extremity and having its discharge apers ture 25 conically counterbored as shown at I 13; the purpose of the conical formation exso'teriorly and interiorly being'to adapt the nozzle to either enter and center itself in i the oil inlet port of the bearing tobe lubricated, or to center itself on t e oil nilpple form a chamber for the sprin 16, and back of said spring chamber it is urther counterbored at 27 and interiorly threaded for screwing onto the end 40 of thelpump cylinder 4. Said ump' cylinder 4 has its lower end inwardl anged, as seen at 15, toafiord a seat for t e checkvalve 14 yieldingly held against that seat by the Mounted axially with respect to the reservenientl voir 1 and pump cylinder 4 is a plunger 28 whose lower. end portion,5 constitutes the pump piston-being diameteredto fit pistonwise in the pump cylinder member 4. Conthe lunger 28 is of the same diameter t roug out its length and at ,its upper end it extends outthrough the mp2 and ,olnetm.

and closing the inlet, a vacuum will bore 8, forcin 4, ieaa. Application for guide bearing disc, 3 which. close the upper end of the reservoir 1, and above the reservoir it is provided with a knob ,6 to serve as an operatin'g handle suitably shaped for conveniently applying maximum manual pressure to drive the piston down into the pump cylinder 4. 'Z is a stop collar on the plunger 28 for limiting the up-th'rust or withdrawal movement. i

The lower portion 5 of the plun er consti;

tuti'ng the pump piston is axially ored at 8 from the lower end to-a point which at the in-thrust position of the piston, shown in Figure 3, is just above the portion of reduced diameter which constitutes thepump cylinder as seen in Figure 3. And at this point, that is, the-upper end of the bore 8, the piston is crossbored,as shown at 9, to connect the axial bore outwardl of the reservoir 1. At t e lower end of'the axial bore 8 of the piston member it is the cage flexed inwardly after the ball is insorted, as seen in Figure 4.

The cap 2, carrying the guide bearing disc 3, is interiorl threaded for screwin into the with the chamber upper end o 'the reservoir 1 and a apted to be unscrewed and withdrawn for filling the reservoir.

Upon considering the above described structure it will be understood that the reservoir 1 bein filled with lubricant, the piston bein at t e time withdrawn to any convenient istance to omit the withdrawal .of the cap sufliciently or obtaining access to the reservoir for filhn it; and the cap having been re laced, the 5 ii any, or thelubrioant, it

epression of the lungerto the imit of its stroke in the cylinder 4' the cylinder 4 prior to the tion of e plunger, the valve 14 bein seated roduced in the cylinder 4 below the withdrawing' piston which will cause lubricant to be forced in through the cross ports 9 and axial out past the valve 10 any air or lubricant w ch may have been in the said ,bore at the beginm I ng of. the operation, so that at theend of the retracting movement of the piston its bore and the space below it in bore ofthe cylinder 4 very elfective pressure can beproduced by hand for driving the lubricant forceably into the bearings or oil circulatory system of the machine to be served the device.

It will be further noted that at the extreme retracted position of the piston, shown in Figure 1, its lower end is above-the upper I I end of the restricted bore of the cylinder 4.

"the cy der'4; and, as seen, as the diameter immediately A'purpose of this featureof construction is that if under any circumstances, such-as clog- "ng of the ports 9 or bore 8 of the piston, or 1amming of the valve 10 in its seat, the entrance of lubricant through the ports 9' and down to the bore 8 and past the valve 10 in the retracting movement of the piston should be prevented or should occur deficiently, to the extent that the lubricant fails to enter by the course indicated into. the bore of the cyl-" inder 4, in the retracting movement of the piston, to which extent there will be produced by the retracting movement of the iston a partial vacuum in the bore of the-cy inend of the piston has passed above the bore of the cyhnder, which it fitsclosely, into the portion of larger thereabove, the lubricant in the chamber will'be forced down into linder bore to fill the vacuum created therein; and thus the .cylinder will be filled ready for discharge of lubricant upon the next in-thrust of the plunger as it is designedto be filled through the ports 9'and bore 8 when this passage is unobstructed.

I claim:

1. A lubricant injector comprising a lubricant-holding barrel having ahead at one end and at its discharge end a reduced portion 0 relativelysmall cross-section, a plunger extending axiallythrough the barrel emerging in this movement seated'upwardly so' through tion and at the inner end adapted to be thrust into the reducedportionfitting the same pistonwise for ej ectlng the lubricant, a discharge nozzle at the end of the reduced portion and an inwardly seating check valvein said nozzle ada ted to open under the discharge. pressure; t e plu r having an axial bore and a port opening t erefrom into the barrel back of the reduced terminal portion thereof when the plunger is at in-thrust position, and a valve in the axial bore seating in a direction the head thereof for manual opera:

opposite to the in-thrust' lubricant-discharg- 1 ing movement of the plunger.

2. A lubricant injector of the class described comprising,'in combination, cant-holdin barrel having a head at one end, a cylin er at the other end of said barrel, said cylinder of smaller cross section than said barrel and supplied with lubricant therefrom, a plunger'reciprocable in said cylinder to discharge lubricant at high pressure, said plunger having a passage therethroughfor establishing direct communicaition between said fcyhnder and said barrel, valve means for said passag --to permit flow of lu-' .bricant therethrough in one direction only, and nozzle means connected to said 0 linder a lubriand receiving the lubricant discharge there} from, said nozzle affording a lubricant tight connection with a part. to be lubricated.

3. A lubricant injector of the class described compri'sin in combination, a lubricant-holdin barre acylinder axially aligned with said arrel and carried thereby, said cylinder of relatively small crpss'section and supplied with lubricant from said barrel, a

plunger reciprocable in said cylinder to disf my name, this 26th day of April, 1928.

I CHARLES s. BURTON.

said plunger'and creating a seal connecting said cylinder said cylin- 

